Defines dateType for the grid

<div class="definition">
    String, default = null
</div>

If dataType is not defined, the default one comes from
<a href="w2utils.settings" class="method">w2utils.settings.dataType</a>.
<div style="height: 10px"></div>

This property can be set during object creation:
<textarea class="javascript">
let grid = new w2grid({
    name: 'grid',
    dataType: 'JSON',
    columns: [
        { field: 'recid', text: 'ID', size: '50px' },
        { field: 'lname', text: 'Last Name', size: '30%' },
        { field: 'fname', text: 'First Name', size: '30%' },
        { field: 'email', text: 'Email', size: '40%' },
        { field: 'sdate', text: 'Start Date', size: '120px' },
        { field: 'sdate', text: 'End Date', size: '120px' }
    ]
});
</textarea>

Or any time during run-time:
<textarea class="javascript">
grid.dataType = 'JSON';
</textarea>
